Thomas keywobth



(No Modem T. KEYWORTH.

SELF ADJUSTING eRUTeH FOR PENDULUMS. P No. 247,657. Patented Sept. 27,1881.

UNITED STATES PATENT OFFICE.

THOMAS KEYWORTH, OF HAMILTON, ONTARIO, CANADA.

SELF-ADJUSTING CRUTCH FOR PENDULUMS.

SPECIFICATION forming part of Letters Patent No. 247,657, dated September 27, 1881.

Application filed May 26, 1881. (No model.)

To all whom it may concern:

Be it known that I, THOMAS KEYWORTH, of the city of Hamilton, in the county of VVentworth, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Clock-Movements; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same.

The object of my invention is to provide a simple means of modifying the common clockescapernent, (which stops when the position of the clock is changed from a level support to its base,) that the motion of the pendulum will not be interfered with by any tilting of the clock ordinarily incident to the use thereof upon any ordinary support however departing from a perfect level.

By reference to the drawings forming a part of this specificati0n,it will be seen that Figure lis a front view, showing that portion of an improved elock-escapement constructed according to my invention. Fig. 2 is a like view, representing the corresponding part of a common escapement. Figs. 3 and 4 are detail views, showing parts of the structure.

In order to carry out myinvention, I devote the usual sten1,a, of the anchor Aof the common escapement (see Fig. 2) to a new purpose by turning it laterally and bending it upward and inward to form an oblongloop, B, around the shank b of the elastic retai ning-wire, which serves to retain the anchor upon its point. This loop is of sufficient size to permit the requisite vibration of the anchor with reference to the escapement O, and yet of such sufficient proportions as to confine said vibra tions within the requisite limits. I then place at the pivoted point of the saddle (I, which connects the anchor with its point, a tubular bearing,f, which is simply a small metallic or other suitable tube soldered between the two downwardly-projectiu g sides of the saddle, and in line with the usual piv0t-holes of said saddle. The latter is then replaced on its pivot, said pivot being, of course, passed through the tube f. I then replace the usual stem of the anchor by a separate and detachable one, (shown at D in Figs. 1 and 3.) This stem D has at its upper end two elastic lips, a, each of which has at its inner side a semi-cyliudric recess, so that said lips may be clasped upon the tube f, and be retained thereon with an elastic pressure. At the lower end of the said stem D, and extended in a direction at right angles, or substantially so, to the direction of the swingof thependulum, is an oblongloop, 9, through which the pendulum-wire m is passed. It will be seen that (the clock being in operation) when the clock is tilted laterally, the weight of the pendulum, tending to bring the center of vibration vertical with the axis of motion, will cause the lips a to slip on the tube f until the pendulum is brought to the position requisite to the effectjust mentioned, the frictional hold of said lips a upon said tube being meanwhile and at all times sufficient to insure the proper operation of the anchor in connection with the pendulum and escapemen twheel. Furthermore, it the clock be tilted forward or backward the loop 9 permits the pendulum to adjust itselt' forward or back, as the case may be, withoutinterruption to its vibrations.

I am aware that the anchor of a clock-escapement has been provided with an arm moving between two fixed pins on the clock-frame, and I am also aware that the anchor of a clockescapement has been connected with the crutch of the pendulum by a ball-and-socket connection. Such constructions, however, do not constitute my invention, and are not claimed.

Having thus described my device, what I claim as my invention, and desire to secure by Letters Patent, is-

l. Thecombination, with the anchor and the horizontal projecting retaining-wire b, of the stem a, extending laterally from the anchor, and having its end bent around the free end of the retaining-wire in the form of a loop, B, substantially as described.

2. The tube f, fixed in the saddle d of the anchor, in combination with the elastic lips a of the stem D, substantially as andt'or the purpose specified.

3. The pivoted saddled, carrying-the anchor A, and provided with the tubular bearing f, in combination with the bifurcated stem 1), connected with the pendulum-wire m, and having at its upper end two flexible lips, a, a, embracing the tubular bearing in the saddle, substantially as and for the purpose described.

Dated at Hamilton, Ontario, Canada, May 13, 1881.

THOMAS KEYWORTH.

In presence of- J OHN LAVERY, WM. BRUCE. 

